Minnesota Public Radio slideshow:
Pollution cleanup cost is hard to comprehend
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Mary Hoppe's river garden, filled with plants native to Minnesota, keeps runoff from her land from entering the river. It also prevents erosion, something that can pollute a river with sediment. (MPR Photo/Tim Post)

Mary Hoppe's river garden, filled with plants native to Minnesota, keeps runoff from her land from entering the river. It also prevents erosion, something that can pollute a river with sediment.

(MPR Photo/Tim Post)
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